单项选择题

The world's supplies of copper _______.

A. have been gradually being exhausted
B. have gradually exhausted
C. are gradually exhausted
D. are being gradually exhausted

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单项选择题

The American basketball team announced that they would not _______ first place to any team.

A. yoke
B. yell
C. yield
D. yearn

单项选择题

The indoor swimming pool seems to be a great deal more luxurious than _______.

A. is necessary
B. being necessary
C. to be necessary
D. it is necessary

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